| National City to Commerce (California) | 110.25 mi (177.43 km) |
| National City to Commerce City (Colorado) | 843.38 mi (1,357.29 km) |
| National City to Compton (California) | 106.99 mi (172.19 km) |
| National City to Comstock Park (Michigan) | 1,844.34 mi (2,968.17 km) |
| National City to Concord (California) | 459.03 mi (738.73 km) |
| National City to Concord (Missouri) | 1,549.74 mi (2,494.06 km) |
| National City to Concord (New Hampshire) | 2,552.09 mi (4,107.19 km) |
| National City to Concord (North Carolina) | 2,084.56 mi (3,354.77 km) |
| National City to Conneaut (Ohio) | 2,089.41 mi (3,362.57 km) |
| National City to Connersville (Indiana) | 1,836.26 mi (2,955.18 km) |
| National City to Conroe (Texas) | 1,281.49 mi (2,062.35 km) |
| National City to Converse (Texas) | 1,131.39 mi (1,820.79 km) |
| National City to Conway (Arkansas) | 1,419.06 mi (2,283.76 km) |
| National City to Conway (Florida) | 2,136.85 mi (3,438.93 km) |
| National City to Conway (South Carolina) | 2,187.73 mi (3,520.81 km) |
